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Message-ID: <20141028142541.GA19097@wfg-t540p.sh.intel.com>
Date: Tue, 28 Oct 2014 22:25:41 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: LKP <lkp@...org>, linux-kernel@...r.kernel.org
Subject: WARNING: CPU: 0 PID: 61 at kernel/sched/core.c:7312 __might_sleep()
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/wait
commit 245747099820df3007f60128b1264fef9d2a69d2
Author: Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed Sep 24 10:18:55 2014 +0200
Commit: Peter Zijlstra <peterz@...radead.org>
CommitDate: Mon Oct 27 10:42:51 2014 +0100
sched: Debug nested sleeps
Validate we call might_sleep() with TASK_RUNNING, which catches places
where we nest blocking primitives, eg. mutex usage in a wait loop.
Since all blocking is arranged through task_struct::state, nesting
this will cause the inner primitive to set TASK_RUNNING and the outer
will thus not block.
Another observed problem is calling a blocking function from
schedule()->sched_submit_work()->blk_schedule_flush_plug() which will
then destroy the task state for the actual __schedule() call that
comes after it.
Cc: torvalds@...ux-foundation.org
Cc: tglx@...utronix.de
Cc: ilya.dryomov@...tank.com
Cc: umgwanakikbuti@...il.com
Cc: mingo@...nel.org
Cc: oleg@...hat.com
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20140924082242.591637616@infradead.org
===================================================
PARENT COMMIT NOT CLEAN. LOOK OUT FOR WRONG BISECT!
===================================================
120 /kernel/i386-randconfig-r2-1027/592ed717ef33150f6888c333c28021283cc9aabc
To bisect errors in parent:
/c/kernel-tests/queue-reproduce /kernel/i386-randconfig-r2-1027/592ed717ef33150f6888c333c28021283cc9aabc/dmesg-quantal-kbuild-20:20141027231410:i386-randconfig-r2-1027:3.18.0-rc2-00036-g592ed71:139 BUG: kernel test crashed
Attached dmesg for the parent commit, too, to help confirm whether it is a noise error.
+---------------------------------------------------+------------+------------+------------+
| | 592ed717ef | 2457470998 | 2d55520314 |
+---------------------------------------------------+------------+------------+------------+
| boot_successes | 1080 | 267 | 110 |
| boot_failures | 120 | 33 | 21 |
| BUG:kernel_test_crashed | 110 | 30 | 16 |
| WARNING:at_kernel/locking/lockdep.c:check_flags() | 10 | 0 | 3 |
| backtrace:might_fault | 2 | | |
| backtrace:SyS_perf_event_open | 3 | 0 | 1 |
| backtrace:mutex_lock_nested | 1 | | |
| WARNING:at_kernel/sched/core.c:__might_sleep() | 0 | 3 | 2 |
| backtrace:cleanup_net | 0 | 3 | 2 |
| backtrace:register_perf_hw_breakpoint | 0 | 0 | 1 |
| backtrace:hw_breakpoint_event_init | 0 | 0 | 1 |
| backtrace:perf_init_event | 0 | 0 | 1 |
| backtrace:perf_event_alloc | 0 | 0 | 1 |
+---------------------------------------------------+------------+------------+------------+
[ 122.133640] Fix your initscripts?
[ 122.133905] trinity-c0 (23733) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt.
[ 122.247299] ------------[ cut here ]------------
[ 122.247328] WARNING: CPU: 0 PID: 61 at kernel/sched/core.c:7312 __might_sleep+0x50/0x249()
[ 122.247334] do not call blocking ops when !TASK_RUNNING; state=2 set at [<c106ffd9>] prepare_to_wait+0x3c/0x5f
[ 122.247339] Modules linked in:
[ 122.247349] CPU: 0 PID: 61 Comm: kworker/u2:1 Not tainted 3.18.0-rc2-00037-g24574709 #136
[ 122.247350] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 122.247368] Workqueue: netns cleanup_net
[ 122.247377] c1071d83 d2b83dd8 d2b83dac c15887b1 d2b83dc8 c104c4c6 00001c90 c1068ebf
[ 122.247383] 00000000 c17b67e3 0000026d d2b83de0 c104c508 00000009 d2b83dd8 c17b5d4b
[ 122.247388] d2b83df4 d2b83e0c c1068ebf c17b5cec 00001c90 c17b5d4b 00000002 c106ffd9
[ 122.247389] Call Trace:
[ 122.247393] [<c1071d83>] ? down_trylock+0x23/0x2c
[ 122.247402] [<c15887b1>] dump_stack+0x16/0x18
[ 122.247413] [<c104c4c6>] warn_slowpath_common+0x66/0x7d
[ 122.247416] [<c1068ebf>] ? __might_sleep+0x50/0x249
[ 122.247419] [<c104c508>] warn_slowpath_fmt+0x2b/0x2f
[ 122.247422] [<c1068ebf>] __might_sleep+0x50/0x249
[ 122.247424] [<c106ffd9>] ? prepare_to_wait+0x3c/0x5f
[ 122.247426] [<c106ffd9>] ? prepare_to_wait+0x3c/0x5f
[ 122.247432] [<c158c364>] mutex_lock_nested+0x23/0x347
[ 122.247436] [<c1075105>] ? trace_hardirqs_on+0xb/0xd
[ 122.247439] [<c158eb0c>] ? _raw_spin_unlock_irqrestore+0x66/0x78
[ 122.247445] [<c1570e10>] rtnl_lock+0x14/0x16
[ 122.247449] [<c156516b>] default_device_exit_batch+0x54/0xf3
[ 122.247452] [<c1570e1f>] ? rtnl_unlock+0xd/0xf
[ 122.247454] [<c1070233>] ? __wake_up_sync+0x12/0x12
[ 122.247461] [<c155e35d>] ops_exit_list+0x20/0x40
[ 122.247464] [<c155ec96>] cleanup_net+0xbe/0x140
[ 122.247473] [<c105ffe4>] process_one_work+0x29e/0x643
[ 122.247479] [<c1061215>] worker_thread+0x23a/0x311
[ 122.247482] [<c1060fdb>] ? rescuer_thread+0x204/0x204
[ 122.247486] [<c10648cc>] kthread+0xbe/0xc3
[ 122.247490] [<c158f4c0>] ret_from_kernel_thread+0x20/0x30
[ 122.247492] [<c106480e>] ? kthread_stop+0x364/0x364
[ 122.247495] ---[ end trace 2073c37ae3c8b3b4 ]---
[ 157.390879] Unregister pv shared memory for cpu 0
git bisect start 2d55520314eb5603b855ac1b994705dc6a352d9e 522e980064c24d3dd9859e9375e17417496567cf --
git bisect good c3f9b6ec744e12ff09677c4c0cb3164ad5b62702 # 19:25 300+ 36 Merge branch 'sched/core'
git bisect good 344c57c17c7f857f9c92317e0d5cbb5c59f8d6e0 # 19:49 300+ 62 Merge branch 'perf/urgent'
git bisect good 54de76b06a8098c11f15857a57e23c6e630a34b6 # 20:19 300+ 66 Merge branch 'perf/core'
git bisect good 126b6dbcbedb5c0defe5c39e0310feed061569bf # 20:51 300+ 50 exit: Deal with nested sleeps
git bisect good 8641f9cba8ce5f3bfc5da47861180617cbfc6e7f # 22:02 300+ 68 module: Fix nested sleep
git bisect bad 245747099820df3007f60128b1264fef9d2a69d2 # 22:25 142- 18 sched: Debug nested sleeps
git bisect good 592ed717ef33150f6888c333c28021283cc9aabc # 22:59 300+ 27 net: Clean up sk_wait_event() vs might_sleep()
# first bad commit: [245747099820df3007f60128b1264fef9d2a69d2] sched: Debug nested sleeps
git bisect good 592ed717ef33150f6888c333c28021283cc9aabc # 00:15 900+ 120 net: Clean up sk_wait_event() vs might_sleep()
git bisect bad 2d55520314eb5603b855ac1b994705dc6a352d9e # 00:19 0- 21 Merge branch 'sched/wait'
git bisect good cac7f2429872d3733dc3f9915857b1691da2eb2f # 01:33 900+ 66 Linux 3.18-rc2
git bisect good 7a891e6323e963f3301e44bdeee734028e34d390 # 02:26 900+ 93 Add linux-next specific files for 20141027
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
initrd=yocto-minimal-i386.cgz
wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd
kvm=(
qemu-system-x86_64
-cpu kvm64
-enable-kvm
-kernel $kernel
-initrd $initrd
-m 320
-smp 1
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "dmesg-yocto-vp-26:20141027222812:i386-randconfig-r2-1027:3.18.0-rc2-00037-g24574709:136" of type "text/plain" (49334 bytes)
View attachment "dmesg-quantal-kbuild-20:20141027231410:i386-randconfig-r2-1027:3.18.0-rc2-00036-g592ed71:139" of type "text/plain" (46065 bytes)
View attachment "config-3.18.0-rc2-00037-g24574709" of type "text/plain" (92205 bytes)
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